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Plant and Cell Physiology Advance Access first published online on June 20, 2005
This version published online on June 20, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci158
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received January 5, 2005
Accepted June 15, 2005

Regular Paper

A Sex Pheromone, Protoplast-Release-Inducing Protein (PR-IP) Inducer, Induces Sexual Cell Division and Production of PR-IP in Closterium

Yuki Tsuchikane 1*, Tadashi Fujii 2, Motomi Ito 1, and Hiroyuki Sekimoto 3

1 Department of General Systems Studies, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan
2 Graduate School of Life Sciences, Toyo University, 1-1-1 Izumino, Itakura-machi, Ora-gun, Gunma 374-0193, Japan
3 Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan; Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, 2-8-1 Mejirodai, Bunkyo-ku, Tokyo 112-8681, Japan

* To whom correspondence should be addressed.
Yuki Tsuchikane, E-mail: tsuchik{at}dolphin.c.u-tokyo.ac.jp


  Abstract

The sex pheromones of a protoplast-release-inducing protein (PR-IP) inducer and a sexual-cell-division-inducing pheromone-minus (SCD-IP-minus) that mediates the sexual reproduction of heterothallic Closterium peracerosum-strigosum-littorale (C. psl) complex were investigated in this study. Recombinant PR-IP inducer produced by yeast cells was prepared and assayed for production of PR-IP and induction of SCD. Both biological activities were observed after treating mating-type plus (mt+) cells with the recombinant pheromone. SCD was induced by exposure to a lower concentration of the same pheromone and by a shorter treatment period with the pheromone than was production of PR-IP. This indicates that the previously characterized PR-IP inducer has both PR-IP-inducing and SCD-inducing activities with mt+ cells, although the inducing mechanisms of the two pheromones differ.

Keywords: Closterium; conjugation; pheromone; sexual cell division; sexual reproduction.
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